EP0243690B1 - Cellule ou réservoir de flottation - Google Patents

Cellule ou réservoir de flottation Download PDF

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Publication number
EP0243690B1
EP0243690B1 EP87104540A EP87104540A EP0243690B1 EP 0243690 B1 EP0243690 B1 EP 0243690B1 EP 87104540 A EP87104540 A EP 87104540A EP 87104540 A EP87104540 A EP 87104540A EP 0243690 B1 EP0243690 B1 EP 0243690B1
Authority
EP
European Patent Office
Prior art keywords
tank
flotation cell
mixing tube
feature
flotation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP87104540A
Other languages
German (de)
English (en)
Other versions
EP0243690A3 (en
EP0243690A2 (fr
Inventor
Peter Schweiss
Hans-Dieter Dörflinger
Hans-Otto Henrich
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JM Voith GmbH
Original Assignee
JM Voith GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by JM Voith GmbH filed Critical JM Voith GmbH
Priority to AT87104540T priority Critical patent/ATE69398T1/de
Publication of EP0243690A2 publication Critical patent/EP0243690A2/fr
Publication of EP0243690A3 publication Critical patent/EP0243690A3/de
Application granted granted Critical
Publication of EP0243690B1 publication Critical patent/EP0243690B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/66—Pulp catching, de-watering, or recovering; Re-use of pulp-water
    • D21F1/70—Pulp catching, de-watering, or recovering; Re-use of pulp-water by flotation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/14—Flotation machines
    • B03D1/1443—Feed or discharge mechanisms for flotation tanks
    • B03D1/1456—Feed mechanisms for the slurry
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/14—Flotation machines
    • B03D1/1443—Feed or discharge mechanisms for flotation tanks
    • B03D1/1475—Flotation tanks having means for discharging the pulp, e.g. as a bleed stream
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/14—Flotation machines
    • B03D1/24—Pneumatic
    • B03D1/247—Mixing gas and slurry in a device separate from the flotation tank, i.e. reactor-separator type
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S261/00—Gas and liquid contact apparatus
    • Y10S261/75—Flowing liquid aspirates gas

Definitions

  • the invention relates to a flotation tank according to the preamble of claim 1.
  • a flotation tank is known from DE-A-31 20 202.
  • a flotation container with an injector device has become known (US-A-41 10 210), in which the injector mouth is approximately halfway between the suspension level and the bottom of the Container is arranged.
  • the injector mouth is approximately halfway between the suspension level and the bottom of the Container is arranged.
  • the side walls of which are chamfered at the bottom, but the foam outlet is provided on the other side, namely on the straight longitudinal wall of the flotation container, and the outflow direction of the injector is essentially vertical, with a mixing section or a mixing tube missing.
  • the object of the invention is to achieve an improved flotation effect with good foam removal despite the simplicity of a flotation container constructed as just described.
  • the mixing tube 1 dips essentially vertically from above after it has passed through the jacket wall of the container is in the suspension.
  • the mouth 2, which is designed as a radial diffuser, is located a considerable distance above the bottom of the container, the distance between the suspension surface or the overflow edge 7 of the foam discharge opening being considerably smaller than the distance between the mouth 2 and the container bottom.
  • the ratio of the distances f 1 / f 2 is approximately between 0.3 and 0.5, preferably between 0.3 and 0.4.
  • the foam discharge opening 6 leads the foam to a foam channel 8 which extends axially along the jacket of the container. On the same side as the foam channel 8 there is also the liquid discharge opening 9 with a discharge flange 10. This discharge opening 9 is located very far down, practically on the bottom of the container.
  • the central axis of the mixing tube 1, through which the entire amount of suspension supplied to each flotation cell is introduced, is located in the half of the container which lies on the other side of the foam channel 8 and the discharge opening 9.
  • the distance 11 from the central axis (vertical diameter) of the flotation tank is preferably between 0.15 and 0.25 times, most preferably between 0.18 and 0.22 times the diameter D of the cross-sectional area shown Flotation cell.
  • This cell or the container is designed as a horizontal cylinder, that is to say has a base body with an essentially circular cross section. A horizontal ellipse can also be used as a cross section. Then the ratio of the distance 1 1 just referred to the horizontal diameter of the ellipse.
  • the cover plate 11 which covers the discharge opening 9 and creates a discharge channel 12, which extends along the container shell, preferably from one boundary wall 19 of each flotation cell to the other boundary wall 20.
  • trigger slots 13 and 14 are provided in the region of the shell of the flotation container , wherein the upper trigger slot 14 has a gap width which is between 0.1 and 0.3 times, preferably is between 0.2 and 0.3 times, and the lower take-off slot has a gap width which is between 0.1 and 0.2 times the inner diameter of the mixing tube 1.
  • the cover wall preferably has an arcuate course, which - as shown - can also be approximately polygonal, so that its upper surface is inclined obliquely upward in order to prevent air from becoming stuck in the exhaust duct 12.
  • the injector preferably has an orifice 3 close to the surface of the suspension, followed by air intake slots 5 in the jacket of the mixing tube 1. As shown in dash-dot lines, a central air intake pipe 21 can also be passed through the panel.
  • the arrangement shown results in the best possible flotation effect with maximum utilization of the entire container cross section.
  • the container cross-section is used to the greatest possible extent, it being possible to increase the throughput of the suspension considerably without the flotation effect being impaired; On the contrary, the flotation effect is considerably improved, so that the number of flotation cells connected in series can still be reduced. It must be taken into account here that the vertical component of the suspension flowing downward must be smaller than the rate of ascent of the air bubbles with attached dirt particles. Neither these air bubbles, nor any air bubbles at all, should get into the discharge opening 9.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biotechnology (AREA)
  • Paper (AREA)
  • Micro-Organisms Or Cultivation Processes Thereof (AREA)
  • Filling Of Jars Or Cans And Processes For Cleaning And Sealing Jars (AREA)
  • Physical Water Treatments (AREA)

Claims (7)

  1. Récipient ou cellule de flottaison comportant des injecteurs avec des points d'aspiration d'air, en amont d'un tuyau mélangeur pénétrant essentiellement dans la direction verticale dans le liquide de flottaison, et ayant un orifice avec une direction d'écoulement pratiquement horizontale, le réservoir ayant une section axiale circulaire, avec une arête de débordement axiale pour l'extraction de la mousse et l'extraction de liquide d'un même côté de l'enveloppe du réservoir, caractérisé en ce que l'axe du tuyau mélangeur (1) est décalé latéralement par rapport à l'axe vertical de la section axiale du réservoir de 0,15 à 0,25 fois le diamètre de la section axiale du réservoir vers le côté d'extraction de liquide et l'orifice (2) de l'injecteur ou du tuyau mélangeur (1) se trouve à une hauteur (f₁) comprise entre 0,3 et 0,5 fois la hauteur (niveau f₂) de l'arête de débordement de mousse (7), en-dessous du niveau de cette arête (7) et l'orifice d'extraction de liquide (9) est prévu au voisinage immédiat du fond du réservoir.
  2. Réservoir de flottaison selon la revendication 1, caractérisé en ce que l'axe du tuyau mélangeur (1) est décalé de l'axe médian vertical de la section axiale du réservoir de 0,18 à 0,22 fois la section axiale du réservoir à l'opposé du côté d'extraction du liquide.
  3. Réservoir de flottaison selon la revendication 1 ou 2, caractérisé en ce que l'orifice (2) de l'injecteur ou du tuyau mélangeur (1) est situé à une hauteur comprise entre 0,3 et 0,45 fois la hauteur (niveau f₂) de l'arête de débordement de mousse (7) en-dessous du niveau de cette arête (7).
  4. Réservoir de flottaison selon l'une des revendications 1 à 3, caractérisé par une tôle de forme courbe ou en cornière (11) qui recouvre l'orifice d'extraction de liquide (9), cette tôle étant prévue le long du fond du réservoir et laisse un intervalle d'extraction de liquide (13, 14).
  5. Récipient de flottaison selon la revendication 4, caractérisé en ce que l'intervalle supérieur (14) du canal d'extraction (12) correspond à 0,1 et 0,3 fois le diamètre intérieur du tuyau mélangeur (1) et l'arête d'extraction intérieure (13) est comprise entre 0,1 et 0,2 fois le diamètre intérieur du tuyau mélangeur (1).
  6. Récipient de flottaison selon la revendication 5, caractérisé en ce que l'arête d'extraction supérieure (14) est comprise entre 0,2 et 0,3 fois le diamètre intérieur du tuyau mélangeur (1).
  7. Récipient de flottaison selon l'une des revendications 1 à 6, caractérisé en ce que l'orifice (2) du tuyau mélangeur (1) est formé par un diffuseur radial à direction d'écoulement pratiquement horizontale.
EP87104540A 1986-05-02 1987-03-27 Cellule ou réservoir de flottation Expired - Lifetime EP0243690B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87104540T ATE69398T1 (de) 1986-05-02 1987-03-27 Flotationsbehaelter oder -zelle.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3614933A DE3614933C1 (de) 1986-05-02 1986-05-02 Flotationsbehaelter oder -zelle
DE3614933 1986-05-02

Publications (3)

Publication Number Publication Date
EP0243690A2 EP0243690A2 (fr) 1987-11-04
EP0243690A3 EP0243690A3 (en) 1989-06-14
EP0243690B1 true EP0243690B1 (fr) 1991-11-13

Family

ID=6300056

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87104540A Expired - Lifetime EP0243690B1 (fr) 1986-05-02 1987-03-27 Cellule ou réservoir de flottation

Country Status (6)

Country Link
US (1) US4726897A (fr)
EP (1) EP0243690B1 (fr)
JP (1) JP2593309B2 (fr)
AT (1) ATE69398T1 (fr)
DE (1) DE3614933C1 (fr)
ES (1) ES2027648T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008056506A1 (de) * 2008-11-08 2010-05-12 Voith Patent Gmbh Mischvorrichtung

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1329277C (fr) * 1986-09-25 1994-05-03 Graeme John Jameson Methode et appareil de separation par flottation en colonne
DE8701636U1 (de) * 1987-02-04 1987-03-19 J.M. Voith Gmbh, 7920 Heidenheim Injektor
DE4116916C2 (de) * 1991-05-24 1994-09-22 Escher Wyss Gmbh Flotationseinrichtung zur Störstoff- insbesondere Druckfarbenentfernung aus Altpapiersuspensionen
DE4309918C2 (de) * 1993-03-26 1994-09-15 Voith Gmbh J M Flotationszelle mit einem Injektor
DE4314507C1 (de) * 1993-05-03 1994-06-23 Voith Gmbh J M Injektor für Flotationseinrichtungen
US5529190A (en) * 1995-02-06 1996-06-25 Ahlstrom Machinery, Inc. Gas sparged hydrocyclone with foam separating vessel
AT401734B (de) * 1995-04-27 1996-11-25 Trimmel Engelbert Dipl Ing Dr Verfahren und vorrichtung zum inkontaktbringen einer flüssigkeit mit einem gas, insbesondere zur reinigung
DE19615089C1 (de) * 1996-04-17 1997-04-10 Voith Sulzer Stoffaufbereitung Flotationsverfahren und Vorrichtung zu seiner Durchführung
US6955989B2 (en) * 2001-11-30 2005-10-18 Xerox Corporation Use of a U-groove as an alternative to using a V-groove for protection against dicing induced damage in silicon
AT411155B (de) * 2002-03-27 2003-10-27 Andritz Ag Maschf Vorrichtung zum abtrennen von feststoffen aus flüssigkeiten mittels flotation
AT412216B (de) 2003-01-24 2004-11-25 Andritz Ag Maschf Verfahren und vorrichtung zur belüftung von suspensionen
US7537674B1 (en) 2006-06-12 2009-05-26 Narayanasamy Seenivasan Closed floatation de-inking module for recycled paper
US7544271B1 (en) 2006-06-12 2009-06-09 Narayanasamy Seenivasan Open flotation de-inking module for recycled paper
US7562777B1 (en) 2006-06-12 2009-07-21 Narayanasamy Seenivasan Flotation cell injector assembly for use with open or closed flotation deinking modules for recycled paper
JP4538479B2 (ja) * 2007-09-04 2010-09-08 日本製紙株式会社 フローテーター
FI122400B (fi) 2010-05-28 2011-12-30 Metso Paper Inc Flotaatiokenno ja menetelmä kuitususpension siistaamiseksi

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4110210A (en) * 1975-06-02 1978-08-29 Envirotech Corporation Dispersed gas flotation process
GB1537751A (en) * 1975-06-02 1979-01-04 Envirotech Corp Dispersed gas apparatus and flotation process
DE2634494C2 (de) * 1976-07-31 1983-04-14 Bayer Ag, 5090 Leverkusen Neue Injektoren zur Flüssigkeitsbegasung
US4255262A (en) * 1979-03-26 1981-03-10 U.S. Filter Corporation Hydraulic powered mixing apparatus
DE3008476A1 (de) * 1980-03-05 1981-09-17 Bayer Ag, 5090 Leverkusen Verfahren zur flotation und verwendung von trichterduesen zur flotation
EP0037513B1 (fr) * 1980-04-09 1984-08-08 Feldmühle Aktiengesellschaft Dispositif de flottation pour le désencrage de suspensions de matière fibreuse
CS216048B1 (en) * 1980-06-16 1982-10-29 Svatopluk Mackrle Appliance for the flotation separation of the suspension or emulsion from the liquids
DE3120202C2 (de) * 1981-05-21 1986-06-26 J.M. Voith Gmbh, 7920 Heidenheim Einrichtung zum Deinken von Altpapier durch Flotation
DE3144386C2 (de) * 1981-11-07 1983-12-29 J.M. Voith Gmbh, 7920 Heidenheim Injektorflotationsapparat
JPS592435U (ja) * 1982-06-25 1984-01-09 三菱重工業株式会社 浮遊選別機
US4564457A (en) * 1983-11-03 1986-01-14 L'eau Claire Systems, Inc. Upflow gas eductor induced air floatation separator
US4606822A (en) * 1984-11-01 1986-08-19 Miller Francis G Vortex chamber aerator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008056506A1 (de) * 2008-11-08 2010-05-12 Voith Patent Gmbh Mischvorrichtung

Also Published As

Publication number Publication date
JPS62262758A (ja) 1987-11-14
EP0243690A3 (en) 1989-06-14
ES2027648T3 (es) 1992-06-16
ATE69398T1 (de) 1991-11-15
JP2593309B2 (ja) 1997-03-26
DE3614933C1 (de) 1987-10-22
US4726897A (en) 1988-02-23
EP0243690A2 (fr) 1987-11-04

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